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<H1><A NAME="_tapi2_varstring_str"></A>VARSTRING</H1>

<P>The <B>VARSTRING</B> structure is used for returning variably sized strings. It is used both by the line device class and the phone device class. </P>

<PRE class=syntax>typedef struct varstring_tag {
  DWORD  dwTotalSize;
  DWORD  dwNeededSize;
  DWORD  dwUsedSize;
  DWORD  dwStringFormat;
  DWORD  dwStringSize;
  DWORD  dwStringOffset;
} VARSTRING, FAR *LPVARSTRING; </PRE>

<H4>Members</H4>

<DL>
<DT><B>dwTotalSize</B> </DT>

<DD>The total size, in bytes, allocated to this data structure. </DD>

<DT><B>dwNeededSize</B> </DT>

<DD>The size, in bytes, for this data structure that is needed to hold all the returned information. </DD>

<DT><B>dwUsedSize</B> </DT>

<DD>The size, in bytes, of the portion of this data structure that contains useful information. </DD>

<DT><B>dwStringFormat</B> </DT>

<DD>The format of the string. This member uses one of the <A HREF="constnts_1cab.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/constnts_1cab.htm">STRINGFORMAT_ Constants</A>. </DD>

<DT><B>dwStringSize</B> </DT>

<DT><B>dwStringOffset</B> </DT>

<DD>The size, in bytes, of the variably sized device field containing the string information, and the offset, in bytes, from the beginning of this data structure. 
</DD>
</DL>

<H4>Remarks</H4>

<P>No extensibility. </P>

<P>If a string cannot be returned in a variable structure, the <B>dwStringSize</B> and <B>dwStringOffset</B> members are set in one of the following ways: 

<UL>
	<LI><B>dwStringSize</B> and <B>dwStringOffset</B> members are both set to zero. </LI>

	<LI><B>dwStringOffset</B> is nonzero and <B>dwStringSize</B> is zero. </LI>

	<LI><B>dwStringOffset</B> is nonzero, <B>dwStringSize</B> is 1, and the byte at the given offset is zero. </LI>
</UL>

<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm  \n\n这个文件不能通过 Teleport Pro 取回, 因为 地址在一个域或为它的开始地址设定的边界的外部路径上.  \n\n你想从服务器打开它吗?'))window.location='http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm'" tppabs="http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm">Requirements</A> </H4>

<P><B>&nbsp;&nbsp;Windows NT/2000: </B>Requires Windows NT 4.0 SP3 or later.<BR>
<B>&nbsp;&nbsp;Windows 95/98: </B>Requires Windows 95 or later.<BR>
<B>&nbsp;&nbsp;Version: </B>Requires TAPI 1.4 or later.<BR>
<B>&nbsp;&nbsp;Header: </B>Declared in Tapi.h.</P>

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